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Vitronectin-binding staphylococci enhance surface-associated complement activation

F Lundberg1, T Lea, A Ljungh

  • 1Department of Medical Microbiology, Lund University, Sweden.

Infection and Immunity
|March 1, 1997
PubMed
Summary
This summary is machine-generated.

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Vitronectin (Vn) on biomaterials inhibits complement activation. However, Staphylococcus hemolyticus, a Vn-binding bacterium, can block this effect, potentially increasing inflammation around medical devices.

Area of Science:

  • Biomaterials Science
  • Immunology
  • Microbiology

Background:

  • Coagulase-negative staphylococci are implicated in medical device infections.
  • Complement activation on biomaterial surfaces causes inflammation.
  • Vitronectin (Vn) is a serum protein that inhibits complement activation and adsorbs to biomaterials.

Purpose of the Study:

  • To investigate if surface-immobilized Vn inhibits complement activation.
  • To determine the effect of Vn-binding staphylococci on complement activation on Vn-coated surfaces.

Main Methods:

  • Measuring complement activation using antibodies against C3c and C9 neoepitope.
  • Assessing complement activation on biomaterial surfaces pre-coated with Vn.
  • Testing the influence of Staphylococcus hemolyticus (Vn-binding) and Staphylococcus epidermidis (non-Vn-binding) on Vn-coated surfaces.

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Main Results:

  • Surface-immobilized Vn effectively inhibits complement activation.
  • Vn's inhibitory effect on heparinized surfaces is minimal.
  • Vn-binding Staphylococcus hemolyticus negated Vn's inhibitory effect on complement activation.
  • Non-Vn-binding Staphylococcus epidermidis did not affect Vn's inhibitory capacity.

Conclusions:

  • Adsorbed Vn on biomaterials can protect against surface-associated complement activation.
  • Vn-binding staphylococci may enhance complement activation by overcoming Vn's inhibitory effect on biomaterial surfaces.